Technically speaking, REBOL is an advanced language that gains its advantage through lightweight domain-specific sublanguages and micro-formats. REBOL introduces the concept of dialecting: small, efficient, domain languages for code, data, and metadata.
Pligg is Web 2.0 Content Management System (CMS) unlike any other existing CMS. Pligg's Web 2.0 user interface gives your visitors a reason to come back to your site by making them decide on the site's content and giving them the chance to social network.